A method and system for calibrating current accuracy of electronically controlled shock absorber

Abstract

The present invention discloses a method and system for calibrating the current accuracy of an electronically controlled shock absorber. The method comprises: at different temperatures, outputting a pulse signal to a proportional solenoid valve in the electronically controlled shock absorber according to a received drive control instruction and an initial calibration parameter so that the proportional solenoid valve outputs a preset current; collecting the preset current output by the proportional solenoid valve; adjusting the initial calibration parameter according to a set reference working current and the preset current; outputting a pulse adjustment signal to the proportional solenoid valve in the electronically controlled shock absorber according to the adjusted initial calibration parameter so that the proportional solenoid valve outputs a preset adjustment current; wherein the difference between the preset adjustment current and the set reference working current satisfies a preset current error accuracy range. In this way, the consistency calibration of the current accuracy is achieved for the built-in proportional solenoid valve of the electronically controlled shock absorber under different ambient temperatures, and the efficiency of the consistency calibration of the built-in proportional solenoid valve of the electronically controlled shock absorber is improved.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technology of electronically controlled shock absorbers, and in particular to a method and system for calibrating the current accuracy of electronically controlled shock absorbers. Background Art

[0002] As passenger car users have higher and higher requirements for the comfort of passenger cars, shock absorbers have gradually changed from actuators that cannot be electrically controlled to intelligent shock absorbers with built-in proportional solenoid valve cores that can be electrically controlled and adjusted. How to better calibrate the consistency accuracy of the built-in proportional solenoid valve of this electronically controlled shock absorber is of great significance to the improvement of the control accuracy of the entire chassis and the improvement of user comfort.

[0003] In the prior art, the test device needs to test the curve corresponding to the test current and damping force on the chassis test bench, which focuses more on mechanical testing. This is not conducive to quickly changing the parameters of the PI control algorithm, and the large test bench cannot superimpose different ambient temperature conditions. Summary of the invention

[0004] The present invention provides a method and system for calibrating the current accuracy of an electronically controlled shock absorber, so as to realize the consistency calibration of the current accuracy of a built-in proportional solenoid valve of the electronically controlled shock absorber under different ambient temperatures, and improve the efficiency of the consistency calibration of the built-in proportional solenoid valve of the electronically controlled shock absorber.

[0005] In a first aspect, an embodiment of the present invention provides a method for calibrating the current accuracy of an electronically controlled shock absorber, the calibration method comprising:

[0006] At different temperatures, according to the received drive control instruction and the initial calibration parameters, a pulse signal is output to the proportional solenoid valve in the electronically controlled shock absorber so that the proportional solenoid valve outputs a preset current;

[0007] collecting a preset current output by the proportional solenoid valve;

[0008] Adjusting the initial calibration parameters according to the set reference working current and the preset current;

[0009] According to the adjusted initial calibration parameters, a pulse adjustment signal is output to the proportional solenoid valve in the electronically controlled shock absorber so that the proportional solenoid valve outputs a preset adjustment current; wherein the difference between the preset adjustment current and the set reference working current satisfies a preset current error accuracy range.

[0010] Optionally, it also includes: switching different control channels, and returning to execute outputting different pulse signals to proportional solenoid valves in different electronically controlled shock absorbers according to the received drive control instructions and initial calibration parameters.

[0011] Optionally, the method further includes: receiving the drive control instruction sent by the host computer through a CAN communication module.

[0012] Optionally, it also includes: controlling the current detection module to display the preset adjustment current output by the proportional solenoid valve.

[0013] Optionally, adjusting the initial calibration parameter according to the set reference working current and the preset current includes:

[0014] Get tremor parameters;

[0015] The adjustable reference operating current is determined according to the set reference operating current, the dither parameter and the dither parameter.

[0016] In a second aspect, an embodiment of the present invention provides a current accuracy calibration system for an electronically controlled shock absorber, the calibration system comprising: a host computer, a controller for executing any one of claims 1 to 5, an electronically controlled shock absorber, and a high and low temperature test chamber; the controller comprises a control circuit and a feedback resistor;

[0017] The host computer is used to configure CAN communication parameters to send drive control instructions to the control circuit;

[0018] The controller and the electronically controlled shock absorber are placed in the high and low temperature test chamber; the high and low temperature test chamber is used to place the controller and the electronically controlled shock absorber in different temperatures;

[0019] The control circuit is used to output a pulse signal to the proportional solenoid valve in the electronically controlled shock absorber according to the received drive control instruction and the initial calibration parameters at different temperatures so that the proportional solenoid valve outputs a preset current;

[0020] The feedback resistor is used to collect the preset current output by the proportional solenoid valve and send the preset current to the control circuit;

[0021] The control circuit is also used to collect the preset current output by the proportional solenoid valve; adjust the initial calibration parameters according to the set reference working current and the preset current; output a pulse adjustment signal to the proportional solenoid valve in the electronically controlled shock absorber according to the adjusted initial calibration parameters so that the proportional solenoid valve outputs the preset adjustment current; wherein the difference between the preset adjustment current and the set reference working current satisfies the preset current error accuracy range.

[0022] Optionally, it also includes: a current detection module;

[0023] The current detection module is used to display the preset adjustment current output by the proportional solenoid valve.

[0024] Optionally, the current detection module includes a digital oscilloscope or a multimeter.

[0025] Optionally, a CAN communication module is also included; the CAN communication module is used to forward the drive control instructions sent by the host computer to the control circuit.

[0026] According to the embodiment of the present invention, at different temperatures, according to the received drive control instruction and the initial calibration parameters, a pulse signal is output to the proportional solenoid valve in the electronically controlled shock absorber so that the proportional solenoid valve outputs a preset current; then the preset current output by the proportional solenoid valve is collected; and the initial calibration parameters are adjusted according to the set reference working current and the preset current; according to the adjusted initial calibration parameters, a pulse adjustment signal is output to the proportional solenoid valve in the electronically controlled shock absorber so that the proportional solenoid valve outputs a preset adjustment current; wherein the difference between the preset adjustment current and the set reference working current meets the preset current error accuracy range. In this way, the current accuracy consistency calibration is achieved for the built-in proportional solenoid valve of the electronically controlled shock absorber at different ambient temperatures, and the efficiency of the consistency calibration of the built-in proportional solenoid valve of the electronically controlled shock absorber is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a flow chart of a method for calibrating current accuracy of an electronically controlled shock absorber provided by an embodiment of the present invention;

[0028] Figure 2 is a flow chart of another method for calibrating current accuracy of an electronically controlled shock absorber provided by an embodiment of the present invention;

[0029] Figure 3 It is a structural block diagram of another electric control shock absorber current accuracy calibration system provided by an embodiment of the present invention;

[0030] Figure 4 It is a structural block diagram of another electric control shock absorber current accuracy calibration system provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0031] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0032] Figure 1 is a flow chart of a method for calibrating the current accuracy of an electronically controlled shock absorber provided by an embodiment of the present invention. Figure 1 As shown, the calibration method includes the following steps:

[0033] S110. Under different temperatures, output a pulse signal to a proportional solenoid valve in the electronically controlled shock absorber according to the received drive control instruction and the initial calibration parameters so that the proportional solenoid valve outputs a preset current.

[0034] The current accuracy calibration method of the electronically controlled shock absorber is executed by a controller, and the controller realizes the drive control of the electronically controlled shock absorber through a proportional integral parameter adjustment control algorithm. In this embodiment, the controller first outputs a pulse signal to the proportional solenoid valve in the electronically controlled shock absorber according to the drive control instruction and the initial calibration parameters, and the pulse signal drives the proportional solenoid valve coil to induce a preset current. It should be noted here that the initial setting parameters are the proportional KP parameter and the integral KI parameter initially set in the proportional integral parameter adjustment control algorithm.

[0035] S120, collecting the preset current output by the proportional solenoid valve.

[0036] The controller integrates a sampling resistor, which can collect the preset current actually output by the proportional solenoid valve to provide feedback current in the proportional-integral parameter adjustment control algorithm.

[0037] S130, adjusting the initial calibration parameters according to the set reference working current and the preset current.

[0038] Among them, a reference working current is set in the controller, and the initially calibrated proportional KP parameter and integral KI parameter are adjusted according to the set reference working current and the preset current. For example, when the difference between the set reference working current and the preset current does not meet the preset current difference, the initially calibrated proportional KP parameter and integral KI parameter are adjusted; when the difference between the set reference working current and the preset current meets the current difference, the initially calibrated KP parameter and integral KI parameter are not adjusted.

[0039] S140. Output a pulse adjustment signal to the proportional solenoid valve in the electronically controlled shock absorber according to the adjusted initial calibration parameters so that the proportional solenoid valve outputs a preset adjustment current; wherein the difference between the preset adjustment current and the set reference working current satisfies a preset current error accuracy range.

[0040] Among them, the controller outputs a pulse adjustment signal according to the adjusted initial calibration parameters, and the pulse adjustment signal drives the proportional solenoid valve coil to induce a preset adjustment current, wherein the difference between the preset adjustment current and the set reference working current meets the preset current error accuracy range. In this way, this scheme adjusts the initial calibration parameters by setting the reference working current and the preset current, and outputs a pulse adjustment signal to the proportional solenoid valve in the electronically controlled shock absorber according to the adjusted initial calibration parameters so that the proportional solenoid valve outputs the preset adjustment current; in this way, under different ambient temperatures, the current accuracy consistency calibration is achieved for the built-in proportional solenoid valve of the electronically controlled shock absorber by adjusting the initial calibration parameters, thereby achieving the current closed-loop control accuracy of the proportional solenoid valve, and improving the efficiency of the consistency calibration of the built-in proportional solenoid valve of the electronically controlled shock absorber.

[0041] Optionally, based on the above embodiment, Figure 2FIG. 1 is a flow chart of another method for calibrating the current accuracy of an electronically controlled shock absorber provided by an embodiment of the present invention. Figure 2 As shown, the calibration method includes the following steps:

[0042] S210, receiving the drive control instruction sent by the host computer through the CAN communication module.

[0043] Among them, the host computer configures the interface type of the CAN communication module, the CAN communication rate and the CAN communication drive control instruction storage path to send the CAN communication drive control instruction to the controller through the CAN communication module.

[0044] S220. Under different temperatures, output a pulse signal to a proportional solenoid valve in the electronically controlled shock absorber according to the received drive control instruction and the initial calibration parameters so that the proportional solenoid valve outputs a preset current.

[0045] S230, collecting the preset current output by the proportional solenoid valve.

[0046] S240, adjusting the initial calibration parameters according to the set reference working current and the preset current.

[0047] Wherein, in some embodiments, adjusting the initial calibration parameters according to the set reference working current and the preset current includes: obtaining the tremor parameter, and determining the set adjustable reference working current according to the set reference working current, the tremor parameter and the preset current. It should be noted here that the tremor parameter is a parameter that fluctuates above and below the set reference working current, and exemplarily, the tremor parameter is 1%; the set tremor reference working current can be determined according to the set reference working current and the tremor parameter, and exemplarily, the set tremor reference working current fluctuates 1% above and below the set reference working current; then, the adjustable reference working current is determined according to the set tremor reference working current and the preset current, and exemplarily, when the current difference between the set tremor reference working current and the preset current meets the preset current difference, the initial calibration parameters are not adjusted; when the current difference between the set tremor reference working current and the preset current does not meet the preset current difference, the initial calibration parameters are adjusted.

[0048] S250. Output a pulse adjustment signal to the proportional solenoid valve in the electronically controlled shock absorber according to the adjusted initial calibration parameters so that the proportional solenoid valve outputs a preset adjustment current; wherein the difference between the preset adjustment current and the set reference working current satisfies a preset current error accuracy range.

[0049] S260, controlling the current detection module to display the preset regulating current output by the proportional solenoid valve.

[0050] Among them, the current detection module can include a digital oscilloscope, and the controller can control the digital oscilloscope to display the preset adjustment current output by the proportional solenoid valve according to the pulse adjustment signal, so as to facilitate the on-site calibration personnel to further optimize the adjusted initial calibration parameters according to the display data of the digital oscilloscope to further achieve the control of the current accuracy of the electronically controlled shock absorber.

[0051] S270, switching different control channels, and returning to execute outputting different pulse signals to proportional solenoid valves in different electronically controlled shock absorbers according to the received drive control instructions and initial calibration parameters.

[0052] Among them, when the current accuracy calibration of a specific electronically controlled shock absorber is completed, the controller controls the switching of different control channels, and returns to execute the output of different pulse signals to the proportional solenoid valves in different electronically controlled shock absorbers according to the received drive control instructions and initial calibration parameters, collects the preset currents output by other different proportional solenoid valves, adjusts the initial calibration parameters according to the set reference working current and the preset current, and outputs pulse adjustment signals to the proportional solenoid valves in other different electronically controlled shock absorbers according to the adjusted initial calibration parameters so that the proportional solenoid valves output the preset adjustment current, thereby realizing the current accuracy calibration of other different electronically controlled shock absorbers by switching different control channels.

[0053] The embodiment of the present invention also provides a current accuracy calibration system for an electronically controlled shock absorber. Figure 3 FIG. 1 is a schematic diagram of the structure of another current accuracy calibration system for an electronically controlled shock absorber provided by an embodiment of the present invention. Figure 3As shown, the calibration system includes: a host computer 10, a controller 20 executing the above embodiment, an electronically controlled shock absorber 30 and a high and low temperature test chamber 40; the controller 20 includes a control circuit 21 and a feedback resistor 22; the host computer 10 is used to configure CAN communication parameters to send drive control instructions to the control circuit 21; wherein the CAN communication parameters include the interface type of the CAN communication module, the CAN communication rate and the storage path of the CAN communication drive control instructions; the controller 20 and the electronically controlled shock absorber 30 are placed in the high and low temperature test chamber 40; the high and low temperature test chamber 40 is used to and the electronically controlled shock absorber 30 are placed in different temperature states; the control circuit 21 is used to output a pulse signal to the proportional solenoid valve in the electronically controlled shock absorber 30 at different temperatures according to the received drive control instructions and the initial calibration parameters so that the proportional solenoid valve outputs a preset current; wherein, the temperature set in the high and low temperature test box 40 in this embodiment can be a normal temperature of 23°C, a high temperature of 75°C and a low temperature of -40°C, so that the controller 20 can simulate the current accuracy calibration process of the electronically controlled shock absorber at different ambient temperatures, and provide current accuracy calibration data support for the electronically controlled shock absorber at different ambient temperatures. The feedback resistor 22 is used to collect the preset current output by the proportional solenoid valve and send the preset current to the control circuit 21; the control circuit 21 is also used to collect the preset current output by the proportional solenoid valve; adjust the initial calibration parameters according to the set reference working current and the preset current; output a pulse adjustment signal to the proportional solenoid valve in the electronically controlled shock absorber according to the adjusted initial calibration parameters so that the proportional solenoid valve outputs the preset adjustment current; wherein, the difference between the preset adjustment current and the set reference working current meets the preset current error accuracy range.

[0054] The control circuit of the present scheme adjusts the initial calibration parameters by setting a reference working current and a preset current, and outputs a pulse adjustment signal to the proportional solenoid valve in the electronically controlled shock absorber according to the adjusted initial calibration parameters so that the proportional solenoid valve outputs the preset adjustment current; in this way, under different ambient temperatures, the current accuracy consistency calibration is achieved for the built-in proportional solenoid valve of the electronically controlled shock absorber by adjusting the initial calibration parameters, thereby achieving the current closed-loop control accuracy of the proportional solenoid valve and improving the efficiency of the consistency calibration of the built-in proportional solenoid valve of the electronically controlled shock absorber.

[0055] Optional, Figure 4 FIG. 1 is a schematic diagram of the structure of another current accuracy calibration system for an electronically controlled shock absorber provided by an embodiment of the present invention. Figure 4 As shown, the calibration system further includes a current detection module 50; the current detection module 50 is used to display a preset adjustment current output by the proportional solenoid valve.

[0056] The controller 20 can control the digital oscilloscope to display the preset adjustment current output by the proportional solenoid valve according to the pulse adjustment signal, so as to facilitate the on-site calibration personnel to optimize the initial calibration parameters after adjustment according to the display data of the digital oscilloscope.

[0057] Optional, see Figure 4 , the current detection module 50 includes a digital oscilloscope or a multimeter.

[0058] Optional, see Figure 4 The calibration system also includes a CAN communication module; the CAN communication module is used to forward the drive control instructions sent by the host computer 10 to the control circuit 21.

[0059] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A method for calibrating the current accuracy of an electronically controlled shock absorber, characterized in that: include: At different temperatures, according to the received drive control instruction and the initial calibration parameters, a pulse signal is output to the proportional solenoid valve in the electronically controlled shock absorber so that the proportional solenoid valve outputs a preset current; collecting a preset current output by the proportional solenoid valve; Adjusting the initial calibration parameters according to the set reference working current and the preset current; Outputting a pulse adjustment signal to a proportional solenoid valve in the electronically controlled shock absorber according to the adjusted initial calibration parameters so that the proportional solenoid valve outputs a preset adjustment current; wherein the difference between the preset adjustment current and the set reference working current satisfies a preset current error accuracy range; The initial calibration parameters are adjusted according to the set reference working current and the preset current, including: obtaining a tremor parameter; determining a set adjustable reference working current according to the set reference working current, the tremor parameter and the preset current; wherein the tremor parameter is a parameter that fluctuates above and below the set reference working current; the tremor parameter is set to 1%; determining a set tremor reference working current according to the set reference working current and the tremor parameter; when the current difference between the set tremor reference working current and the preset current meets the preset current difference, the initial calibration parameters are not adjusted; when the current difference between the set tremor reference working current and the preset current does not meet the preset current difference, adjusting the initial calibration parameters; The control current detection module displays the preset adjustment current output by the proportional solenoid valve to further optimize the initial calibration parameters after adjustment.

2. The method for calibrating the current accuracy of an electronically controlled shock absorber according to claim 1, characterized in that: Also includes: Switch different control channels, and return to execute outputting different pulse signals to proportional solenoid valves in different electronically controlled shock absorbers according to the received drive control instructions and initial calibration parameters.

3. The method for calibrating the current accuracy of an electronically controlled shock absorber according to claim 1, characterized in that: Also includes: The drive control instruction sent by the host computer is received through the CAN communication module.

4. An electronically controlled shock absorber current accuracy calibration system, characterized in that: include: A host computer, a controller for executing the current accuracy calibration method of the electronically controlled shock absorber according to any one of claims 1 to 3, an electronically controlled shock absorber, a high and low temperature test chamber and a current detection module; the controller includes a control circuit and a feedback resistor; The host computer is used to configure CAN communication parameters to send drive control instructions to the control circuit; The controller and the electronically controlled shock absorber are placed in the high and low temperature test chamber; the high and low temperature test chamber is used to place the controller and the electronically controlled shock absorber in different temperatures; The control circuit is used to output a pulse signal to the proportional solenoid valve in the electronically controlled shock absorber according to the received drive control instruction and the initial calibration parameters at different temperatures so that the proportional solenoid valve outputs a preset current; The feedback resistor is used to collect the preset current output by the proportional solenoid valve and send the preset current to the control circuit; The control circuit is also used to collect the preset current output by the proportional solenoid valve; adjust the initial calibration parameters according to the set reference working current and the preset current; output a pulse adjustment signal to the proportional solenoid valve in the electronically controlled shock absorber according to the adjusted initial calibration parameters so that the proportional solenoid valve outputs the preset adjustment current; wherein the difference between the preset adjustment current and the set reference working current meets the preset current error accuracy range; wherein adjusting the initial calibration parameters according to the set reference working current and the preset current includes: obtaining a tremor parameter; determining a set adjustable reference working current according to the set reference working current, the tremor parameter and the preset current; wherein the tremor parameter is a parameter that fluctuates above and below the set reference working current; the tremor parameter is set to 1%; determining a set tremor reference working current according to the set reference working current and the tremor parameter; when the current difference between the set tremor reference working current and the preset current meets the preset current difference, the initial calibration parameters are not adjusted; when the current difference between the set tremor reference working current and the preset current does not meet the preset current difference, the initial calibration parameters are adjusted; The current detection module is used to display the preset adjustment current output by the proportional solenoid valve to further optimize the initial calibration parameters after adjustment.

5. The current accuracy calibration system for an electronically controlled shock absorber according to claim 4, characterized in that: The current detection module includes a digital oscilloscope or a multimeter.

6. The current accuracy calibration system for an electronically controlled shock absorber according to claim 4, characterized in that: It also includes a CAN communication module; the CAN communication module is used to forward the drive control instructions sent by the host computer to the control circuit.

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